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I have another 27.5 wheelset but not with the right standards - it would need to be QR135 at the back but Thru axle 15 at the front
Axle and brake standards are a pain in the arse. Disc trucker in 26 looks good apart from it's flat mount which would mean new brakes (and possibly even shifters, not sure). Leaning towards Bridge Club as I have a QR 27.5 dynamo wheelset which would fit and think pretty much everything else from the MTB could be swapped over
Could you borrow a set of 27.5 or 26" wheels to try them for size?
I think your main issue will be the short wheelbase - the back looks quite short in the picture.